Turnable Second Harmonic Generation from an Organic Dye Laser

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Abstract
Ultraviolet light has been generated from a Rhodamine 60 organic dye laser by frequency doubling with a KDP crystal. The second harmonic was tuned from 2900Å to 3000Å with peak powers of 40 watts. Organic dye lasers have now been reported with output wave-lengths extending throughout the visible and near infrared1-12. The tunability4,6,13 and output energies now available in the visible protion of the spectrum suggest frequency doubling as a means of obtaining a tunable source of ultraviolet light. We wish to report the observation of tunable second harmonic radiation centered at 2950Å generated from the laser output of a 10−4 molar solution of Rhodamine 6G dissolved in ethyl alcohol.